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The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays |
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| Authors: | P R den Hartog L Kuiper W Hermsen N Rea M Durant B Stappers V M Kaspi R Dib |
| Institution: | 1. SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands 2. Astronomical Institute, University of Amsterdam, Kruiskade 403, 1098 SJ, Amsterdam, The Netherlands 3. Department of Astronomy & Astrophysics, University of Toronto, 60 Saint George Street, MP 1404D, Toronto, ON, M5S 3H8, Canada 4. ASTRON, The Netherlands Foundation for Research in Astronomy, P.O. Box 2, 7990 AA, Dwingeloo, The Netherlands 5. Physics Department, McGill University, 3600 University Street, Montreal, PQ, H3A 2T8, Canada |
| Abstract: | For the first time a quasi-simultaneous multi-wavelength campaign has been performed on an Anomalous X-ray Pulsar from the radio to the hard X-ray band. 4U 0142+61 was an INTEGRAL target for 1 Ms in July 2005. During these observations it was also observed in the X-ray band with Swift and RXTE, in the optical and NIR with Gemini North and in the radio with the WSRT. In this paper we present the source-energy distribution. The spectral results obtained in the individual wave bands do not connect smoothly; apparently components of different origin contribute to the total spectrum. Remarkable is that the INTEGRAL hard X-ray spectrum (power-law index 0.79±0.10) is now measured up to an energy of ～230 keV with no indication of a spectral break. Extrapolation of the INTEGRAL power-law spectrum to lower energies passes orders of magnitude underneath the NIR and optical fluxes, as well as the low ～30 μJy (2σ) upper limit in the radio band. |
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